TM 55-1510-220-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
ENGINE RUNUP (CONT)
n.
Cabin altitude indicator - Set to planned cruise altitude plus 500 feet (if this setting does not result in a
CABIN ALT indication of at least 500 feet over takeoff field pressure altitude, adjust as required).
o.
Rate control - Set.
p.
Cabin pressure dump switch - Set to PRESS position.
*11.
Generators and regulators - Check by observing volt-loadmeters for
C1-6
the following conditions:
a.
Positive charging rate.
b.
27.5 to 29.0 volts.
c.
A load indication not exceeding 0.85.
d.
Turn generators on one at a time to insure that each generator comes on line.
e.
Voltmeters must read within 1 volt of each other.
f.
Load paralleling must be with- in 1 increment on the load- meter scale.
*12. Inverter volt-frequency meters - Check voltage between 110 and 120
C37,38
volts and frequency between 390 and 410 Hz.
*13. Autofeather system - Check as follows:
F4-18
a.
Condition levers - LOW IDLE.
2-30
